Just because Eibach makes the springs doesn't mean its the same as the Eibach kit. The H&R coilovers use Bilstein dampers and the Bilstein coilovers use H&R springs yet they are very different kits. I'd like to know what the actual spring rates are for the Sachs kit, they may be very different from the springs in the Eibach kits.There are some old posts on this somewhere but it was discovered that the Sachs kit is the exact same thing as the Eibach Pro kit. Eibach supplies the springs and Sachs supplies the dampers.